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A kind of silver-doped titanium dioxide nanometer antibacterial agent and preparation method thereof

A nano-antibacterial agent, titanium dioxide technology, applied in the field of silver-doped titanium dioxide nano-antibacterial agent and its preparation, can solve problems such as limited application, achieve long-lasting and effective antibacterial effect, excellent antibacterial and antifungal effect, and improve stability.

Active Publication Date: 2022-02-18
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reaction sterilization has the advantages of quick effect, good durability, and no secondary pollution. However, it can only work under the condition of light, which limits its application in the condition of no light or weak light.

Method used

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  • A kind of silver-doped titanium dioxide nanometer antibacterial agent and preparation method thereof

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Effect test

Embodiment 1

[0032] A preparation method of silver-doped titanium dioxide nanometer antibacterial agent, it comprises the following steps:

[0033] (1) preparation of titanium dioxide sol by hydrolysis and polycondensation;

[0034] Add butyl titanate and water to ethanol for hydrolysis and polycondensation reaction, and also add hydrolysis reaction inhibitor acetic acid to control the hydrolysis reaction speed, wherein the molar ratio of butyl titanate, water, ethanol and acetic acid is 1:2.5: 10:2; react to get titanium dioxide sol; the temperature of hydrolysis and polycondensation reaction is 25℃, and the reaction time is 12h.

[0035] (2) preparation of silver-doped titania sol;

[0036] Add complexation stabilizer citric acid to the silver nitrate solution, then slowly add it dropwise to the above-mentioned titanium dioxide sol, and fully react to obtain the silver-doped titanium dioxide sol; wherein the molar ratio of silver nitrate to citric acid is 100, and the molar ratio of sil...

Embodiment 2

[0042] A preparation method of silver-doped titanium dioxide nanometer antibacterial agent, it comprises the following steps:

[0043] (1) preparation of titanium dioxide sol by hydrolysis and polycondensation;

[0044] Add butyl titanate and water to ethanol for hydrolysis and polycondensation reaction, and also add hydrolysis reaction inhibitor acetic acid to control the hydrolysis reaction speed, wherein the molar ratio of butyl titanate, water, ethanol and acetic acid is 1:2.8: 11:2.2; react to obtain titanium dioxide sol; the temperature of hydrolysis and polycondensation reaction is 28°C, and the reaction time is 13.5h.

[0045] (2) preparation of silver-doped titania sol;

[0046] Add complexation stabilizer citric acid to the silver nitrate solution, then slowly add it dropwise into the above-mentioned titanium dioxide sol, and fully react to obtain the silver-doped titanium dioxide sol; wherein the molar ratio of silver nitrate to citric acid is 150, and the molar ra...

Embodiment 3

[0052] A preparation method of silver-doped titanium dioxide nanometer antibacterial agent, it comprises the following steps:

[0053] (1) Hydrolysis and polycondensation prepare titanium dioxide sol;

[0054] Add butyl titanate and water to ethanol for hydrolysis and polycondensation reaction, and also add hydrolysis reaction inhibitor acetic acid to control the hydrolysis reaction speed, wherein the molar ratio of butyl titanate, water, ethanol and acetic acid is 1:3: 12:2.5; react to obtain titanium dioxide sol; the temperature of hydrolysis and polycondensation reaction is 30°C, and the reaction time is 15h.

[0055] (2) preparation of silver-doped titania sol;

[0056] Add complexation stabilizer citric acid to the silver nitrate solution, then slowly add it dropwise to the above-mentioned titanium dioxide sol, and fully react to obtain the silver-doped titanium dioxide sol; wherein the molar ratio of silver nitrate to citric acid is 200, and the molar ratio of silver nitr...

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Abstract

The invention provides a preparation method of a silver-doped titanium dioxide nanometer antibacterial agent, which comprises the following steps: (1) preparing a titanium dioxide sol by hydrolysis and polycondensation; (2) preparing a silver-doped titanium dioxide sol; (3) gelling the silver-doped titanium dioxide sol; (4) Gel drying and heat treatment to obtain silver-doped titanium dioxide nanopowder. The antibacterial agent prepared by the invention has the advantages of both the titanium dioxide antibacterial agent and the silver-based inorganic antibacterial agent: non-toxic, high efficiency, strong antibacterial and anti-mildew ability, long anti-bacterial and anti-mildew effect. In addition, by adding silver to titanium dioxide, defects can be introduced into the crystal lattice of titanium dioxide to form doping energy levels, and the energy band structure of titanium dioxide can be changed, thereby improving the activity of titanium dioxide and overcoming the problem of easy discoloration of a single silver-based antibacterial agent. defect.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a silver-doped titanium dioxide nanometer antibacterial agent and a preparation method thereof. Background technique [0002] In recent years, the application in environmental protection has attracted more and more attention. Semiconductor particles, such as CdS, ZnO, TiO 2 and PbS can generate electron / hole pairs under the action of ultraviolet light, react with dissolved oxygen and water, and generate hydroxyl radicals (OH) and negative oxygen ions (O 2－ ) can completely degrade organic pollutants in wastewater into carbon dioxide, water and inorganic acids, and has shown great application potential in the field of wastewater treatment. Among these materials, TiO 2 With good catalytic activity, wide range of raw material sources and low toxicity, it has become one of the most widely studied materials. However, due to the bulk and large particles of TiO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N59/16A01P1/00A01P3/00B82Y30/00B82Y40/00
CPCA01N59/16B82Y30/00B82Y40/00
Inventor 杨桂生蒋超杰李术姚晨光
Owner HEFEI GENIUS NEW MATERIALS
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